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Every batch of sperm represents an opportunity for genetic typos - called de novo mutations - to be passed on. A 20-year-old man and woman will each pass on about 20 de novo mutations to a baby they conceive. By the time the couple is 40, a woman's total has remained at 20, while a man's has jumped to 65 - and it keeps climbing from there.

Technological discoveries are the spermatozoa of social change.

It is always a vulgar and often an unhealthy pastime, and it is a vice which does not go alone; the man who gambles will find himself capable of any evil.

Every moment of resistance to temptation is a victory.

In consequence of inventing machines, men will be devoured by them.

Fertility is measured by offspring, not by honours.

Half the vices which the world condemns most loudly have seeds of good in them and require moderate use rather than total abstinence.

Some men are so macho they'll get you pregnant just to kill a rabbit.

I am always shocked that there are still a handful of defenders of the dubious practice of abstinence, surely the worst idea since chocolate-covered ants.